Process for health preserving bast fibres and the jute fibre specific health preservation assistant used in the same

ABSTRACT

The invention relates to the fibre assistant field, in particular relates to a process for health preserving bast fibres and a jute fibre specific health preserving assistant used in the same. this invention provides a process of health preserving bast fibres, wherein, comprising the steps of: a. spraying the prepared assistant on bast fibres, wherein, the weight proportion of said assistant and said bast fibres ranges from 0.4:1 to 0.5:1. b. placing the bast fibres processed through step a in a first health preserving container for 2-3 days; c. taking out the bast fibres processed through step b from the first health preserving container, turning over such bast fibres, and placing them in a second health preserving container; then heating such bast fibres upto 50-60 □, after that, storing the heated bast fibres in said second health preserving container for 5-6 days.

TECHNICAL FIELD

The invention relates to the fibre assistant field, in particularrelates to a process for health preserving bast fibres and a jute fibrespecific health preserving assistant used in the same.

BACKGROUND

With the rising of human material living standards, more and more peoplebegin to move their attention from the durability of clothing to thecomfort of clothing. Due to the good moisture absorption, airpermeability, low static and good antibacterial properties of bastfibre, bast fabrics have gained more and more popularity with people.The existing bast fabrics mainly refer to the linen, ramie or thecombination obtained through blended spinning or interweaving saidmaterials with other fibres such as cotton, wool, chemical fibres, orsilk, etc. However, as linen and ramie are expensive, the bast fabricsare not widely used. Jute fibre is one of the most widely used cellulosefibres and only follows cotton fibre in the world. Jute is cheap inprice and has better moisture absorption and drapability than linen andramie, and its antibacterial ability just follows that of hemp, so thatit has great application value and developmental potential. However, thelignin content in jute is quite high (up to 10-13%), which is severaltimes higher than that in linen, and jute fibre is very thick and hard,and with poor spinnability, restraining the use of jute in fabrics. Inthe existing technology, in order to improve the spinnability of saidfibres, the nature fibres must be firstly degummed and thinned However,although the fibres are degummed and thinned, the fibres still remainhard, and are difficult to be spun. Therefore, it is necessary toimprove the fibre traits of the bast fibres that are degummed andthinned

Nowadays, the ordinary process for improving the fibre traits of bastfibres is to health preserving the bast fibres using bast fibre healthpreserving assistant. Said health preserving means after the bast fibresare processed through degumming and thinning, assistants are used toimprove the softness and spinnability of said bast fibres beforespinning; said health preserving assistant can selectively containsoftener (bast softening agent), emulsifying agent, penetrant orhumectant, etc, according to the requirements for the fixed performanceof product. It is found from the study that the selections of differentassistants and different weight proportion of ingredients in saidassistants may cause different effects of improving the spinnability,and moistures of bast fibres. Therefore, in the existing spinningprocess, it is very important for bast fibre spinning industry to selecta good health preserving assistant that is applicable to different bastfibres, and choose the appropriate weight proportion of its ingredients.

For jute fibres, in the ordinary health preserving assistant, the aminosilicone oil is used as the softener. That the amino silicone oilsoftens and smoothes the fibres is mainly because of the amino withinit. In the amino silicone oil, the content of amidogen is defined byammonia value, which refers to the volume of hydrochloric acid with 1equivalent concentration in millilitre used for neutralizing 1 gram ofamino-silicone oil. In general, the higher content of amidogen is, thehigher ammonia value is, and the softer and smoother the processedfibres will be. For the persons having ordinary skills in the art, theyusually raise the ammonia value of amino-silicone oil, in order toimprove the softness of fabrics, so that the ammonia value is generallyabove 0.2. However, high ammonia value causes high smoothness of fibres,small cohesive force between two single fibres, and poor spinnability offibres, thus, generally, the ammonia value selected in the prior art isno more than 0.6. In addition, with the rise of ammonia value ofamino-silicone, the possibility of active hydrogen in amidogen beingoxidized will rise, and it is prone to be oxidized into chromophore,resulting in the yellowing of the fibres. In order to solve thisproblem, further bleaching to the fibres will be conducted in the priorat. However, the conduct of bleaching will increase the cost and willgenerate a lot of waste water.

In regard to the process for health preserving the bast fibres, ChinesePatent publication number.CN1292435A and CN1086273A disclose a processfor health preserving the bast fibres, wherein, firstly the bast fibresare humidified and accumulated stored in the container for 18-30 hoursfor health preservation, then the health persevered bast fibres aretaken out and combined into strips manually; after that, the bast fibrestrips are carded. Likewise, Chinese patent No. CN1796622A discloses aprocess for double modifying the linen second coarse fibres, wherein, inthe course of modifying said linen second coarse fibres, said linensecond coarse fibres should also be health preserved, and this method isalso used for humidifying and health preserving the bast fibres for36-48 hours in a room with 18-25 □. However, the dampening rate ofhealth preserved bast fibres only reaches 15%-18%. In said prior art,the bast fibres are health preserved through humidification at roomtemperature, and the duration for such health preservation is within 48hours. In the above mentioned method, the assistant can not infiltrateinside of the bast fibres due to the room temperature; in addition, itis not able to make the small amount of gum work in the course of healthpreservation, which is remained after degumming of said bast fibres inthe period of pre-treatment. Furthermore, the underlayer of bast fibresin the health preserving container could hardly get in touch with air,relatively to those on the top, restraining the fibres from “breathing”,so as to result in the unclearness between the “cavity” and the “hole”connected to it in the bast fibres, and also the health preservingassistant can not sufficiently infiltrate inside of said bast fibres.Therefore, this may have bad influences on the effect of healthpreserving bast fibres.

SUMMARY OF INVENTION

One of the objectives of this invention is to solve the problem withspinnability of bast fibres, in particular, low ammonia value of aminosilicone oil results in low softness of fibres, and high ammonia valueof amino silicone oil yellows the fabrics and cause high smoothness offibres, so as to deteriorate the cohesive force among fibres and thespinnability of fibres. In order to solve the problems above, a kind ofamino silicone oil with appropriate ammonia value should be selected.The invention also provide a jute fibre specific health preservingassistant that makes the jute fibres have good softness, appropriatewhiteness, and high spinnability.

Another objective of this invention is to solve the problem with theinsufficiency of health preservation of bast fibres. In order to solvethe problems, an improved process of health preserving bast fibres isprovided, in particular, the process allows bast fibre health preservingassistant sufficiently enter the inside of bast fibres, ensuring thebast fibres are sufficient health preserved, and further healthpreserving bast fibres with the gum used in the bast fibrepre-processing stage.

In order to solve the problems above, this invention provides a processof health preserving bast fibres, wherein, comprising the steps of:

-   -   a. spraying the prepared assistant on bast fibres, wherein, the        weight proportion of said assistant and said bast fibres ranges        from 0.4 to 0.5;    -   b. placing the bast fibres processed through step a in a first        health preserving container for 2-3 days;    -   c. taking out the bast fibres processed through step b from the        first health preserving container, turning over such bast        fibres, and placing them in a second health preserving        container; then heating such bast fibres upto 50-60 □, after        that, storing the heated bast fibres in said second health        preserving container for 5-6 days.

The process of health preserving bast fibres, wherein, the bast fibresprocessed through step 3 are taken out from the second health preservingcontainer, and placed at room temperature for 2-6 hours.

The process of health preserving bast fibres, wherein, said bast fibresare hemp fibres or jute fibres.

A just fibre specific health preserving assistant used, containing 0.5-3weight portions of emulsifying agent, wherein, further containing 5-7weight portions of amino-silicone oil, the ammonia value of which rangesfrom 0.3 to 0.4 and the molecular weight ranges from 300 to 30000.

The above mentioned assistant, wherein, containing 1-2 weight portionsof said emulsifying agent and 6 weight portions of said amino-siliconeoil.

The above mentioned assistant, wherein, the ammonia value of saidamino-silicone oil is 0.35.

The above mentioned assistant, wherein, said emulsifying agent isnon-ionic emulsifying agent.

The above mentioned assistant, wherein, said assistant further contains0.5-3 weight portions of moisturizing agent and 0.5-4 weight portions ofhygroscopic agent.

The above mentioned assistant, wherein, said assistant further contains0.5-3 weight portions of non-ionic penetrating agent.

The above mentioned assistant, wherein, containing 0.8-2 weight portionsof said moisturizing agent.

The above mentioned assistant, wherein, containing 1-3 weight portionsof said hygroscopic agent.

The above mentioned assistant, wherein, further containing 5-7 weightportions of quaternary ammonium salt type softening agent.

The above mentioned assistant, wherein, the weight proportion of saidmoisturizing agent and said hygroscopic agent ranges from 2:3 to 4:5.

The above mentioned assistant, wherein, said moisturizing agent isglycerine, and said hygroscopic agent is carbamide.

The above mentioned assistant, wherein, containing 0.8-2 weight portionsof said non-ionic penetrating agent.

The advantages of this invention are described as bellow:

-   (1) The process of health preserving bast fibres is divided into two    stages. At the first stage, bast fibres are health preserved under    the room temperature for 2-3 days, and this enables the assistant to    enter and infiltrate the fibres sufficiently and slowly; as the    temperature is room temperature, the assistant is not able to    sufficiently reach the core of fibre. Therefore, the health    preserving container needs to be heated, and the “cavity” and the    “hole” will be further opened with the rising of said container    temperature, so that the “passage” in the fibre, which the health    preserving assistant moves through, is expanded, thereby    facilitating said assistant to reach the core of bast fibres and    improving the spinnability of said bast fibres.-   (2) When moving the bast fibres from the first health preserving    container to the second health preserving container, the bast fibres    are turned over. The underlayer of the bast fibres in the first    health preserving container come to the top of said bast fibres when    they are placed in the second health preserving container. Then, the    previous underlayer of said bast fibres can sufficient contact the    air, enables the “cavity” in the centre of said bast fibre to    sufficiently “breathe”, thereby allowing the health preserving    assistant sufficiently enter the “cavity” and the “hole” in said    bast fibres for further health preserving.-   (3) At the second stage of the process of health preservation, the    second health preserving container is heated up to 50-60° C. On the    one hand, the gum that remains after the pre-treatment of said bast    fibres through degumming, can be reactivated. It can hydrolyze the    gum in the bast fibres that are not sufficiently degummed, so as to    further separate the bast fibres, and improve the bulkiness of such    bast fibres; on the other hand, the “cavity” and the “hole” of the    bast fibre can be enlarged once said bast fibres are heated, and    this will help the assistant and water infiltrate the inside of the    bast fibres.-   (4) Naturally placing the bast fibres that are health preserved can    enable the water attached to the surface of the bast fibres due to    the high temperature during the process of health preservation, to    evaporate. This can avoid too much water on the surfaces of the bast    fibres, so as to avoid the bast fibres of twisting with the rollers    of machine during the process of spinning, thereby improving the    efficiency and quality of spinning-   (5) In the jute fibre specific health preserving assistant of this    invention, on the one hand, the ammonia value of amino-silicone oil    ranges from 0.3 to 0.4, and the molecular weight of said    amino-silicone oil is small, and the weight proportion of    ingredients of the assistant is well controlled. As the    amino-silicone oil with small molecular weight can effectively enter    the inside of fibres, so as to effectively improve the softness of    the jute fibres, and ensure the appropriate smoothness of the    surface of the jute fibres and the necessary cohesive force among    the jute fibres, thereby improving the spinnability of fibres; on    the other hand, the assistant and the weight proportion of    ingredients in such assistant used can provide appropriate    amino-silicone oil to the fibres, which can make the fibres with the    softness required, and will not enhance the possibility of being    oxidized due to overload of such amino-silicone oil, so as to    effectively avoid yellowing of the jute fibres and ensure the    whiteness of them.-   (6) In this invention, penetrating agent is added to the jute fibre    specific health preserving assistant, and this enables the    amino-silicone oil emulsified to effectively and quickly penetrate    the inside of fibres, thereby improving the health preservation of    fibres.-   (7) In this invention, both of hygroscopic agent and moisturizing    agent are added to the jute fibre specific health preserving    assistant, wherein, said moisturizing agent can effectively retain    the water in the fibres, but loss of water in the fibres may be    caused during the process of weaving; hygroscopic agent can duly    absorb and supply water from outside to the fibres. The moisture    balance between internal and external part of fibres can be ensured    and the moisture regain of fibres required during the process of    weaving jute fibres are kept through well keeping the weight    proportion of hygroscopic agent and moisturizing agent.-   (8) In this invention, quaternary ammonium salt type softening agent    added to the jute fibre specific health preserving assistant can    further improve the softness of the fibres that are health preserved    with amino-silicone oil.

DETAILED DESCRIPTION OF INVENTION

The principles of health preserving jute fibres with the jute fibrespecific health preserving assistant in this invention are as bellows:

-   the amino-group in the amino-silicone oil is basic group, said basic    group can transform to cation ammonium salt group in the help of    acid; the followings are the characteristics of the amino-silicone    oil:-   (1) Being prone to be emulsified by surfactant.-   (2) Improving the softness of said amino-silicone oil.-   (3) Enhancing the cohesiveness among fibres.

After that, the the amino-silicone oil are emulsified by the emulsifyingagent in the health preserving assistant, thereby ensuring the stabilityof the health preserving assistant solution. The surface tension of theamino-silicone oil becomes very small, after the amino-silicone oilforms emulsion, and it also become very easy to spread out on thesurface of the fibres; if the molecular weight is small, theamino-silicone oil will further reach the core of the fibres; As theamino-group in the amino-silicone oil has strong polarity, it willinteract with the carboxyl group and hydroxyl group, forming a solidorientation and absorption on the surface and in the inside of thefibres, meanwhile, the Si—O main strain is formed and has excellencesuppleness, The silicon atom in methyl group reduces the friction amongfibres, allowing the fibres to have good smoothness and softness, andalso making the fibres bulge. In this invention, a majority of theamino-silicone oil emulsified reaches the core of fibres, while aminority of it forms a membrane on the surface of fibres, throughselecting an appropriate ammonia value of the amino-silicone oil andweight portion of the ingredients of the assistant. This may improve thesoftness of jute fibres, and will not reduce the cohesive force amongfibres due to high smoothness of the surfaces of fibres caused by theoverload of said amino-silicone oil, thereby not affecting thespinnability of the fibres. In addition penetrating agent in the healthpreserving assistant allows the active ingredients to enter the fibres,so as to enable much less time of health preserving jute fibres thanusing the health preserving assistant without penetrating agent. Thehealth preserving assistant used in this invention can effectivelyimprove the softness, smoothness and spinnability of jute fibres.

Further more, another jute fibre specific health preserving assistantcreatively adopts both of hygroscopic agent and moisturizing agent asthe ingredients of the health preserving assistant; said moisturizingagent effectively retain the water in the fibres. However, the water inthe fibres may to some extent lose, but the hygroscopic agent may dulyabsorb water into the fibres, thereby ensuring the moisture balance ofthe fibres. The health preserving assistant used can effectively enhancethe cohesive force among fibres, and improve the softness andspinnability of fibres.

Said emulsifying agent is the non-ionic surfactant, the anionicsurfactant or the combination of both of them. Wherein, the non-ionicsurfactant is preferred, because it does not react with the cationamino-silicone oil, thereby not affecting the health preservation offibres.

The penetrating agent is the non ion type penetrating agent. It isselected because the non ion type penetrating agent does not react withthe positive ion type amino-silicone oil, thereby not affecting thehealth preservation of fibres.

The quaternary ammonium salt type softening agent can also be added tosaid health preserving assistant, in order to further health preservingthe fibres, thereby improving the softness of said fibres.

The portion mentioned bellow refers to weight portion.

EXAMPLE 1

The ingredients of the jute fibre specific health preserving assistantin this invention are indicated in weight portion as bellow:

-   Amino-silicone oil with ammonia value of 0.35 and molecular weight    of 300-500: 6 portions;-   Double-alkyl dimethyl quaternary ammonium salt 6 portions;-   Peregal O (emulsifying agent) 2 portions;-   JFC 0.8 portion;

In this example, the amino-silicone oil with ammonia value of 0.35 andmolecular weight of 300-500 is selected. Because the molecular weight ofsaid amino-silicone oil is very small, it can easily enter the fibres,and can effectively improve the suppleness of the fibres. The softnessof fibres can be improved by double-alkyl dimethyl quaternary ammoniumsalt, the fibres can be emulsified by peregal O, and JFC as a kind ofpenetrating agent can accelerate the entry of softening agent into thefibres. The use of abovementioned agents can be very cost effective;wherein, said peragal O is non-ionic emulsifying agent, and is alsocalled peregal oil; it is the condensation compound of epoxyethane andhigher fatty alcohol. Said emulsifying agent is not able to combine withfibres, and is very easy to be washed away.

In addition, the health preserving assistant with above mentionedportions can effectively improve the suppleness, and keep the smoothnessand the whiteness of jute fibres, accelerate the entry of the healthpreserving assistant into the fibres, and enhance the efficiency ofhealth preserving said fibres.

EXAMPLE 2

The ingredients of the jute fibre specific health preserving assistantin this invention are indicated in weight portion as bellow:

-   Amino-silicone oil with ammonia value of 0.35 and molecular weight    of 1000-5000: 5 portions;-   Peregal O (Emulsifying Agent) 1 portion;-   Sulfonated Oil (STO) 0.8 portion;

In addition, the health preserving assistant with above mentioned weightportion can effectively improve the suppleness, and keep the smoothnessand the whiteness of jute fibres, accelerate the entry of the healthpreserving assistant into the fibres, and enhance the efficiency ofhealth preserving said fibres.

EXAMPLE 3

The ingredients of the jute fibre specific health preserving assistantin this invention are indicated in weight portion as bellow:

-   Amino-silicone oil with ammonia value of 0.35 and molecular weight    of 1000-5000: 7 portions;-   Peregal O (Emulsifying Agent) 3 portions;-   Sulfonated Oil (STO) 2 portions;

In addition, the health preserving assistant with above mentioned weightportion can effectively improve the suppleness, and keep the smoothnessand the whiteness of jute fibres, accelerate the entry of the healthpreserving assistant into the fibres, and enhance the efficiency ofhealth preserving said fibres.

EXAMPLE 4

The ingredients of the jute fibre specific health preserving assistantin this invention are indicated in weight portion as bellow:

-   Amino-silicone oil with ammonia value of 0.3 and molecular weight of    10000-15000: 4 portions;-   Emulsifying Agent(OP) 0.5 portion;-   Neutral RP-98 3 portions;

In this example, the amino-silicone oil with ammonia value of 0.3 andmolecular weight of 1000-15000 is selected. Because the molecular weightof said amino-silicone oil is very small, it can easily enter thefibres, and can effectively improve the suppleness of the fibres. Thefibres can be emulsified by emulsifying agent (OP), and neutral RP-98can accelerate the entry of softening agent into the fibres. The use ofabovementioned agents can be very cost effective; wherein, saidemulsifying agent (OP) is a non-ionic emulsifying agent; it is thecondensation compound of epoxyethane and alkylphenol. The healthpreserving assistant with above mentioned weight portion can effectivelyimprove the suppleness, and keep the smoothness and the whiteness ofjute fibres, accelerate the entry of the health preserving assistantinto the fibres, and enhance the efficiency of health preserving saidfibres.

All the said JFC, said sulfonated Oil (STO), and said neutral RP-98 arethe product names, and these products can be purchased in the market.

EXAMPLE 5

The ingredients of the jute fibre specific health preserving assistantin this invention are indicated in weight portion as bellow:

-   Amino-silicone oil with ammonia value of 0.35 and molecular weight    of 300-500: 6 portions;-   Double-alkyl dimethyl quaternary ammonium salt 6 portions;-   Peregal O (emulsifying agent) 2 portions;-   Carbamide (hygroscopic agent) 3 portions;-   Glycerine (Moisturizing agent) 2 portions;

In this example, the amino-silicone oil with ammonia value of 0.35 andmolecular weight of 300-500 is selected. Because the molecular weight ofsaid amino-silicone oil is very small, it can easily enter the fibres,and can effectively improve the suppleness of the fibres. The softnessof fibres can be improved by double-alkyl dimethyl quaternary ammoniumsalt, the fibres can be emulsified by peregal O, and carbamide as a kindof hygroscopic agent can keep the moisture of said fibres, and glycerineas a moisturizing agent has the moisture absorbing ability. The use ofabovementioned agents can be very cost effective; wherein, said peragalO is non-ionic emulsifying agent, and is also called peregal oil; it isthe condensation compound of epoxyethane and higher fatty alcohol. Saidemulsifying agent is not able to combine with fibres, and is very easyto be washed away.

In addition, the health preserving assistant with above mentioned weightportion can effectively improve the suppleness, and keep the smoothnessand the whiteness of jute fibres; in addition, the weight proportion ofcarbamide and glycerine is 2:3 which is one of preferred embodiments,and can obtain an appropriate moisture regain of jute fibres.

EXAMPLE 6

The ingredients of the jute fibre specific health preserving assistantin this invention are indicated in weight portion as bellow:

-   Amino-silicone oil with ammonia value of 0.3 and molecular weight of    1000-3000: 4 portions;-   Peregal O (emulsifying agent) 0.5 portion;-   Carbamide (hygroscopic agent) 0.5 portion;-   Glycerine (Moisturizing agent) 0.5 portion;

The health preserving assistant with above mentioned weight portion caneffectively improve the suppleness, and keep the smoothness and thewhiteness of jute fibres, and can obtain an appropriate moisture regain.

EXAMPLE 7

The ingredients of the jute fibre specific health preserving assistantin this invention are indicated in weight portion as bellow:

-   Amino-silicone oil with ammonia value of 0.4 and molecular weight of    10000-15000: 8 portions;-   Emulsifying Agent (OP) 3 portions;-   Carbamide (hygroscopic agent) 4 portion;-   Glycerine (Moisturizing agent) 3 portion;

In this example, the amino-silicone oil with ammonia value of 0.4 andmolecular weight of 10000-15000 is selected. Because the molecularweight of said amino-silicone oil is very small, it can easily enter thefibres, effectively improving the suppleness of the fibres. Wherein, thefibres can be emulsified by emulsifying agent (OP), carbamide as ahygroscopic agent can keep the moisture of said fibres, and glycerine asa moisturizing agent has the moisture absorbing ability. The use ofabovementioned agents can be very cost effective; wherein, saidemulsifying agent (OP) is non-ionic emulsifying agent; it is thecondensation compound of epoxyethane and alkylphenol. The healthpreserving assistant with above mentioned weight portion can effectivelyimprove the suppleness, and keep the smoothness and the whiteness ofjute fibres; in addition, the weight proportion of carbamide andglycerine is 3:4 which is also one of the preferred embodiments, and canobtain an appropriate moisture regain of jute fibres.

EXAMPLE 8

The ingredients of the jute fibre specific health preserving assistantin this invention are indicated in weight portion as bellow:

-   Amino-silicone oil with ammonia value of 0.3 and molecular weight of    10000-15000: 8 portions;-   Emulsifying Agent (OP) 1.5 portions;-   Carbamide (hygroscopic agent) 1 portion;-   Glycerine (Moisturizing agent) 0.8 portion;

In this example, the amino-silicone oil with ammonia value of 0.3 andmolecular weight of 10000-15000 is selected. Because the molecularweight of said amino-silicone oil is very small, it can easily enter thefibres, effectively improving the suppleness of the fibres. Wherein, thefibres can be emulsified by emulsifying agent (OP), carbamide as ahygroscopic agent can keep the moisture of said fibres, and glycerine asa moisturizing agent has the moisture absorbing ability. The use ofabovementioned agents can be very cost effective; wherein, saidemulsifying agent (OP) is non-ionic emulsifying agent; it is thecondensation compound of epoxyethane and alkylphenol. The healthpreserving assistant with above mentioned weight portion can effectivelyimprove the suppleness, and keep the smoothness and the whiteness ofjute fibres; in addition, the weight proportion of carbamide andglycerine is 4:5 which is also one of the preferred embodiments, and canobtain an appropriate moisture regain of jute fibres. The molecularweight of above mentioned amino-silicone oil can also be 13000-15000,15000-18000, or 18000-20000. Said amino-silicone oil also caneffectively improve the suppleness, and keep the smoothness and thewhiteness of jute fibres; the most important thing is that it can obtainan appropriate moisture regain of jute fibres.

EXAMPLE 9

The health preserving assistant after adding water is sprayed on jutefibres, wherein, the weight proportion of said health preservingassistant and water is 1:30. In one of the preferred embodiments, duringthe process of spraying, said health preserving assistant is sprayed oneach layer of the jute fibres paved, until finishing the paving ofsufficient said jute fibres to be stored in the health preservingcontainer; wherein, the weight proportion of said health preservingassistant and said jute fibres is 0.4:1, thereby providing sufficientsaid health preserving assistant to said jute fibres for healthpreserving.

Then, the paved jute fibres are placed in a first health preservingcontainer for 2 days. At this stage, said health preserving assistant isensured to slowly penetrate the fibres.

After that, the jute fibres are removed out of the first healthpreserving container, and turned over before being placed in a secondhealth preserving container. This can ensure the underlayer of said jutefibres in the first health preserving container to come to the top whensaid jute fibres are placed in the second health preserving container.Then, said jute fibres are heated to 60 □. After that, heating isstopped, and the heated jute fibres are health preserved for 5 days. (1)When moving the bast fibres from the first health preserving containerto the second health preserving container, the bast fibres are turnedover. The previous underlayer of the bast fibres in the first healthpreserving container come to the top of said bast fibres when they areplaced in the second health preserving container. Then, the previousunderlayer of said bast fibres can sufficient contact the air, enablesthe “cavity” in the centre of said bast fibre to sufficiently “breathe”,thereby allowing the health preserving assistant sufficiently enter the“cavity” and the “hole” in said bast fibres for further healthpreserving. (2) The health preserving container is heated, and the“cavity” and the “hole” of said bast fires will be further enlarged withthe rising of said container temperature, so that the “passage” in thefibre, which the health preserving assistant moves through, is expanded,thereby facilitating said health preserving assistant to reach the coreof bast fibres and improving the spinnability of said bast fibres. (3)The second health preserving container is heated up to 50-60° C., sothat the gum remaining after the pre-treatment of said bast fibresthrough degumming, can be reactivated. It can hydrolyze the gum in thebast fibres that are not sufficiently degummed, so as to furtherseparate the bast fibres, and improve the bulkiness of such bast fibres.

The bast fibres health preserved are removed out of the second healthpreserving container, and placed at room temperature for 6 hours. Theplacement of said bast fibres at room temperature at this stage can be avery important step. It enables the water attached to the surfaces ofsaid bast fibres due to the high temperature during the process ofhealth preservation, to evaporate, so that it can avoid too much wateron the surfaces of the bast fibres, so as to avoid the bast fibres oftwisting with the rollers of machine during the process of spinning,thereby improving the efficiency and quality of spinning As an optionalstep, it can be skipped. However, in the preferred embodiment of healthpreserving bast fibres, placement of bast fibres at room temperature hadbetter be adopted.

EXAMPLE 10

The health preserving assistant after adding water is sprayed on jutefibres, wherein, the weight proportion of said health preservingassistant and water is 1:30. In one of the preferred embodiments, duringthe process of spraying, said health preserving assistant is sprayed oneach layer of the jute fibres paved, until finishing the paving ofsufficient said jute fibres to be stored in the health preservingcontainer; wherein, the weight proportion of said health preservingassistant and said jute fibres is 0.4:1, thereby providing sufficientsaid health preserving assistant to said jute fibres for healthpreserving.

Then, the paved jute fibres are placed in a first health preservingcontainer for 2.5 days. At this stage, said health preserving assistantis ensured to slowly penetrate the fibres.

After that, the jute fibres are removed out of the first healthpreserving container, and turned over before being placed in a secondhealth preserving container. Then, said jute fibres are heated to 55° C.After that, heating is stopped, and the heated jute fibres are healthpreserved for 5.5 days. Heating the bast fibres enables the “cavity” andthe “hole” of said bast fibres will be further enlarged with the risingof said container temperature, so that the “passage” in the fibre, whichthe health preserving assistant moves through, is expanded, therebyfacilitating said health preserving assistant to reach the core of bastfibres. In addition, at this temperature, the gum remaining after thepre-treating said bast fibres through degumming, can be reactivated. Itcan hydrolyze the gum in the bast fibres that are not sufficientlydegummed, so as to further separate the bast fibres, and improve thebulkiness of such bast fibres.

Finally, the bast fibres are removed out of the second health preservingcontainer, and placed at room temperature for 5 hours.

EXAMPLE 11

The health preserving assistant after adding water is sprayed on jutefibres, wherein, the weight proportion of said health preservingassistant and water is 1:60. In one of the preferred embodiments, duringthe process of spraying, said health preserving assistant is sprayed oneach layer of the jute fibres paved, until finishing the paving ofsufficient said jute fibres to be stored in the health preservingcontainer; wherein, the weight proportion of said health preservingassistant and said jute fibres is 0.5:1, thereby providing sufficientsaid health preserving assistant to said jute fibres for healthpreserving.

Then, the paved jute fibres are placed in a first health preservingcontainer for 3 days, providing enough time for said health preservingassistant to sufficiently and slowly penetrate the fibres.

After that, the jute fibres are removed out of the first healthpreserving container, and turned over before being placed in a secondhealth preserving container. Then, said jute fibres are heated to 50 □.After that, heating is stopped, and the heated jute fibres are healthpreserved for 6 days. Heating the bast fibres at this stage enables the“cavity” and the “hole” of said bast fibres will be further enlargedwith the rising of said container temperature, so that the “passage” inthe fibre, which the health preserving assistant moves through, isexpanded, thereby facilitating said health preserving assistant to reachthe core of bast fibres. In addition, at this temperature, the gumremaining after the pre-treating said bast fibres through degumming, canbe reactivated. It can hydrolyze the gum in the bast fibres that are notsufficiently degummed, so as to further separate the bast fibres, andimprove the bulkiness of such bast fibres.

Finally, the bast fibres are removed out of the second health preservingcontainer, and placed at room temperature for 2 hours.

It is found from the above processes of health preserving bast fibresthat the moisture regain of bast fibres before health preservationranges from 12%-16%, while the moisture regain of bast fibres afterhealth preservation ranges from 32%-38%. Therefore, the processes ofhealth preserving bast fibres can effectively improve the moistureregain of bast fibres, thereby improving the spinnability of the bastfibres.

In the example 9-11, the weight proportion of health preservingassistant and water are 1:30, 1:45, and 1:60 respectively. However, inthe practice, the weight proportion ranging from 1:30 to 1:60 can helpachieve the objective of this invention, and should be covered by thisinvention.

1. A process of health preserving bast fibres, wherein, comprising thesteps of: a. spraying the prepared assistant on bast fibres, wherein,the weight proportion of said assistant and said bast fibres ranges from0.4:1 to 0.5:1; b. placing the bast fibres processed through step a in afirst health preservation container for 2-3 days; c. taking out the bastfibres processed through step b from the first health preservationcontainer, turning over such bast fibres, and placing them in a secondhealth preservation container; then heating such bast fibres up to 50-60□, after that, storing the heated bast fibres in said second healthpreservation container for 5-6 days.
 2. The process of health preservingbast fibres in claim 1, wherein, the bast fibres processed through step3 are taken out from the second health preservation container, andplaced at room temperature for 2-6 hours.
 3. The process of healthpreserving bast fibres in claim 1, wherein, said bast fibres are hempfibres or jute fibres.
 4. A just fibre specific health preservingassistant used in claim 1, containing 0.5-3 weight portions ofemulsifying agent, wherein, further containing 5-7 weight portions ofamino-silicone oil, the ammonia value of which ranges from 0.3 to 0.4and the molecular weight ranges from 300 to
 30000. 5. The assistant inclaim 4, wherein, containing 1-2 weight portions of said emulsifyingagent and 6 weight portions of said amino-silicone oil.
 6. The assistantin claim 4, wherein, the ammonia value of said amino-silicone oil is0.35.
 7. The assistant in claim 4, wherein, said emulsifying agent isnon-ionic emulsifying agent.
 8. The assistant in claim 4, wherein, saidassistant further contains 0.5-3 weight portions of moisturizing agentand 0.5-4 weight portions of hygroscopic agent.
 9. The assistant inclaim 4, wherein, said assistant further contains 0.5-3 weight portionsof non-ionic penetrating agent.
 10. The assistant in claim 8, wherein,containing 0.8-2 weight portions of said moisturizing agent.
 11. Theassistant in claim 8, wherein, containing 1-3 weight portions of saidhygroscopic agent.
 12. The assistant in claim 8, wherein, furthercontaining 5-7 weight portions of quaternary ammonium salt typesoftening agent.
 13. The assistant in claim 8, wherein, the weightproportion of said moisturizing agent and said hygroscopic agent rangesfrom 2:3 to 4:5.
 14. The assistant in claim 8, wherein, saidmoisturizing agent is glycerine, and said hygroscopic agent iscarbamide.
 15. The assistant in claim 9, wherein, containing 0.8-2weight portions of said non-ionic penetrating agent.